Improvement in elevating-or hoisting apparatus



2Shee ts--Sheet1. P. W. MACKENZIE.

Elevating or Hoisting Apparatus.

'V Patented March 31,1874.

2 Sheets--Sheet 2.

uuunnu Patented March 31, 1874.

P W MACKENZIE Elevating or Hoisting Apparatus. 'Nb.149, 236.

UNITED STATES PATENT QFFIGE.

PHILIP W. MACKENZIE, OF BLAUVELTVILLE, NEIV YORK.

IMPROVEMENT IN ELEVATlNG-OR HOISTING APPARATUS.

Specification forming part of Letters Patent No. 149,236, dated March 31, 1874; application filed March 2, 1874.

To all whom it may concern:

Be it known that I, PHILIP W. MAOKENZI of Blauveltville, in the county of Rockland and State of New York, have invented certain Improvements in Elevating or Hoisting Apparatus, of which the following is a specification: v

This invention is applicable alike to passenger and to goods elevators; and consists, generally, in a combination of a steam-blast exhaust-jet device applied to the hoistway or cylinder mounted thereon, with a piston attached to the traveling platform or car of the elevator, or with a car constructed to operate as a piston, whereby, 011 introducing steam to the jet device, air is exhausted from above the piston, which works within the hoistway or its cylindrical or other extension, and the car or platform is raised by atmospheric pressure. The descent of the car or platform may be effected by gravity, subject to control by checking the admission of air to the upper side of the piston. In the accompanying drawings, which form part of this specification, Figure 1 represents a sectional elevation of a freight-elevator for short lifts, having the main or general features of my invention applied; Fig. 2, a horizontal section at the line as as of the same, and Fig. 3 a side view of the hoisting-platform, detached. Fig. 4 is a sectional elevation of a passenger-elevator constructed in accordance with my invention, and Figs. 5 and 6 vertical and horizontal sections, respectively, upon a larger scale, of the passenger-car used in said elevator.

Similar letters of reference indicate corresponding parts.

Referring, in the first instance, to Figs. 1, 2, and 3 of the drawings, A represents the traveling platform or cage, and B the hoistway, formed of columns provided with vertical guides b b, for rollers c 0, attached to the cage or platform, to run against; also, provided with safety pawls or dogs (I (Z, operated by a hand-lever, 0. Attached to the top of the cage, as by a rod, rope, or chain, f, is a piston, 0, arranged to work in a cylinder, 13, open at its bottom, and mounted on and forming a continuation, as it were, of the hoistway. This cylinder is covered at its top, and fitted at such part with a steam-blast exhaust-jet de' vice, D, the pipe g of which, that supplies the steam, establishes the flow outwardly from the cylinder, thereby exhausting the air above the piston C, so that the platform A is raised by atmospheric pressure.

The steam may be let on and shut off from the jet device, and its flow regulated, as required, therethrough by a cock, h, controlled by a rod, '6, arranged to extend down the hoistway. WVhen steam is shut off from the jet device, then the cage or platform A is free to descend by gravity, and the speed of its descent may be regulated or checked by a valve, is, in the piston, arranged, when open, to admit air to the upper side of the piston, and operated by a rod, 1, which may be fitted with a stop, to bear down on the lever which actuates the safety pawls or dogs, so that when the valve is fully opened, the latter are also thrown into action.

In Figs. 4., 5, and 6 of the drawing, the same principle of operation is carried out in a substantially similar manner, more particularly applicable to a passenger-elevator; but in this case the hoistway B is boxed up or closed in, more especially at its sides and top, and thereby made to form the cylinder or chamber in which the piston 0, attached to the car A, works or said car may be constructed to form the piston. D is the steam-blast exhaust-jet device with its steam-supply pipe 9 applied to the top of the hoistway, and serving to exhaust the air in the hoistway from above the car or its attached piston.

The flow of steam through the pipe 9 is established, or shut off and regulated, as in the previous arrangement herein described, by a cock, h, controlled by a downwardly-extended rod, 6, and which may be fitted at its upper end with stops operating, when the cock his opened, to open a valve, 70, applied to the mouth of the jet device D, and after the steamcock h has been shut, serving, if necessary, to close or partly close the valve 7c, and so to check or shut off the admission of air to the top of the piston O, for the purpose of checking or arresting the descent of the car, in like manner as if said valve 70 were applied directly to the piston. The bottom of the hoistway B may also be constructed to establish an The combination of a steam-blast exhaustjet device, with a piston attached to the car or traveling platform of an elevator, and working within a close cylinder or chamber, from which the air above the piston is exhausted by the action of the jet device, to effect the raising of the car or platform, substantially as specified.

P. W, MACKENZIE.

Witnesses:

HENRY '1. BROWN, MIcrIAEL RYAN. 

